Screw-jack.



R, PORTIBR.

SCREW JACK. 1,067,598.

APPLICATION FILED 1 1113.10, 1913.

2 SHEETS-SHEET 1.

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E I 17 419 I 2 3 Millllllillllll Rosarz'a Fortier. Witnesses: lnvemmW04.Mcoh I V By Attorneys 7 Patented July 15, 1913;

R. PORTIER.

SCREW JACK.

1,067,598. APPLICATION FILED FEB. 10, 1913. Patented 15,

2 SHEETSSHBET 2.

FiGEL Rosario Fortier,

Witnesses:

- Inventor By v Attorneys UNITED @TAW PATENT @FFTQE.

ROSARIO FOR'IIER, OF MONTREAL, QUEBEC, CANADA.

SCREW-JACK.

To all whom it may cnccrn:

Be it known that I, Ros-x1210 FORTIER, a subject of the King of GreatBritain, residing at 396 Gatineau street, Cote des Ne'ges, Montreal,Province of Quebec, Canada, have invented certain new and usefulImprovements in Screw-Jacks; and I do hereby declare that the followingis a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

The invention to be hereinafter described relates to screw jacks.

In order to more clearly disclose the construction, operation, and useof the invention, reference should be had to the accompanying drawingsforming part of the present application.

Throughout the Several figures of the drawings like reference charactersdesignate the same parts.

In the drawings: Figure 1 is a side elevation; Fig. 2 is a central,vertical, cross section on'line 22 of Fig. 1; Fig. 3 is a cen tral,vertical, cross section through the ball retainer; Fig. t is ahorizontal cross section on line 4 t of Fig. 1; Fig. 5 is a verticalcross section on line 55 of Fig. 1; Fig. 6 is a side elevation of amodified jack head; Fig. 7 is a top plan view of a second modificationof jack head; Fig. 8 is a top plan view of a pair of supports adapted tobe used wit-h the jack head of Fig. 7 and Fig. 9 is an end view of oneof the supports of Fig. 8.

The main objects of the invention are to provide a simple, ellicient,economical, durable, and compact screw jack which may be operated ineither direction without changing the direction of swing of the handle.

Referring to the drawings in detail, 1 in dicat-es a hollow standarddetachably connected by a reduced screw threaded extension 2 to a baseplate 3, a flange 4 formed on the lower part of the standard, engagingthe base plate and acting as a stop or limit. This standard isinternally screw threaded to cooperate with the screw threads of apedestal 5 which terminates in a reduced cy lindrical post 6 having anannular groove 7, for a purpose to be later disclosed. A wide collar 8is mounted to revolve freely about the post 6 and rests upon theshoulder Specification of Letters Patent.

Application filed February 10, 1913.

parts to receive the bearings.

Patented July 15,1913.

Serial No. 747,226.

formed by reducing the pedestal 5 to the diameter of the post 6.Suitable ball bearings 9 or like antifriction devices are interposedbetween the collar and shoulder, cooperating ball races being providedin these This collar is chambered out to receive a ratchet wheel 10which is keyed to the post 6. One side of the collar is extended asparallel upper and lower horizontal plates 1% on the outer ends of whichis journaled a socket 11 adapted to receive a suitable handle. Pawl arms12 of a double acting pawl which cooperates with the ratchet wheel 10have free swing between these plates. The pawl is fulcrumed at 13. Theinner wall of the socket 11 is provided with a semicircumferentialgroove 1 ladapted to receive either of the branches of the '1' head 15of the double acting pawl. The interior diameter of the socket 11, plusthe depth of the groove 14:, is slightly greater than the length of theT head, to permit free escapement of the operative arm 12 as the handleis swung back for the next hold. Oppositely acting coil springs 16 drawthe head 15 into the groove 1 L. Consequently, in order to rock the pawlso as to disengage one arm 12 and engage the other, it is only necessaryto rotate the socket 11 so that the groove 1& will receive that branchof the head 15 corresponding to the pawl arm desired to be engaged. Forthis purpose, the end of the handle 17 or the ferrule thereon isprovided with a pin 18 adapted to engage either of two shoulders 19 onthe outer end of the socket. Thus, a simple partial rotation of thehandle will effect such a shifting of the pawl arms 12 as tO'free theengaged one and engage the freed one. Thus the ack may be operated ineither direction without changing the direction of swing of the handle,al as will be evident on reference to Fig. 4.

To the top of the post 6 is removably attached a head 20 of any desiredshape or construction, according to the use to which the jack is to beput. This head is provided with a vertical bore adapted to receive thepost 6 and having its upper part enlarged to permit the free play ofleaf springs 21 having offset curved portions 22 adapted to snap intothe groove 7, and yieldingly hold the head on the post. The lower end ofthe head rests upon the upper face of the collar 8, ball bearings orother suitable antifriction devices being interposed and seated incooperating ball races formed in these parts. A ball retainer in theform of a ring 23 with upwardly directed concave ball engaging flange 24is provided to prevent the balls from slipping out of the lower race.Instead of the head. shown in Fig. 1, either the head shown in Fig. 6 orFig. 7 may be used. The connection to the post 6 is the same.

The head shown in Fig. 7 is formed as a channel with a serrated ortoothed bottom adapted to receive the T-shaped base 25 of the supportshown in Figs. 8 and 9. The base of the T is serrated to cooperate withthe serrations of the head to hold it at various points. By such anarrangement, a single head (Fig. 7) of considerable length may receiveseveral supports like those of Figs. 8 and 9, arranged at intervals, asindicated in Fig. 8. This, of course, gives a very extended hearingsurface. For lubricating purposes, an oil cup 26 is connected to thecollar 8 and communicates with suitable oil supply ducts therein,leading to the ball races and to the interior of the chamber containingthe ratchet wheel 10. The connection between the head 20 and post 6permits the post to rotate freely relatively to the head.

It is thought that the construction, operation, and use of the inventionwill be clear from the preceding detailed description.

Changes may be made in the construction, arrangement, and disposition ofthe several parts of the invention without in any way departing from thefield and scope of the same, and it is meant to include all such withinthis application wherein only a me ferred form has been disclosed.

Having thus fully described my invention, What I claim as new and desireto secure by Letters Patent is:

In a device of the character described, a pedestal, a post formed incontinuation thereof and provided with a groove, a head adapted to fiton said post, and springs carried by said head and adapted to snap intosaid groove.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

ROSARIO FORTIER. Witnesses:

T. MYNARD, HENRY H. BABoooK.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

